<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>html5测试 - canvas</title>
<style>
	*{
		margin:0;
	}
</style>
</head>
<body style="height:100%;">
	<canvas id="canvas" style="height:100%;">
		浏览器不支持canvas
	</canvas>
	
	<script type="text/javascript">
	digit =
	    [
	        [
	            [0,0,1,1,1,0,0],
	            [0,1,1,0,1,1,0],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,0,1,1,0],
	            [0,0,1,1,1,0,0]
	        ],//0
	        [
	            [0,0,0,1,1,0,0],
	            [0,1,1,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [1,1,1,1,1,1,1]
	        ],//1
	        [
	            [0,1,1,1,1,1,0],
	            [1,1,0,0,0,1,1],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,1,1,0],
	            [0,0,0,1,1,0,0],
	            [0,0,1,1,0,0,0],
	            [0,1,1,0,0,0,0],
	            [1,1,0,0,0,0,0],
	            [1,1,0,0,0,1,1],
	            [1,1,1,1,1,1,1]
	        ],//2
	        [
	            [1,1,1,1,1,1,1],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,1,1,0],
	            [0,0,0,1,1,0,0],
	            [0,0,1,1,1,0,0],
	            [0,0,0,0,1,1,0],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,1,1,1,0]
	        ],//3
	        [
	            [0,0,0,0,1,1,0],
	            [0,0,0,1,1,1,0],
	            [0,0,1,1,1,1,0],
	            [0,1,1,0,1,1,0],
	            [1,1,0,0,1,1,0],
	            [1,1,1,1,1,1,1],
	            [0,0,0,0,1,1,0],
	            [0,0,0,0,1,1,0],
	            [0,0,0,0,1,1,0],
	            [0,0,0,1,1,1,1]
	        ],//4
	        [
	            [1,1,1,1,1,1,1],
	            [1,1,0,0,0,0,0],
	            [1,1,0,0,0,0,0],
	            [1,1,1,1,1,1,0],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,1,1,1,0]
	        ],//5
	        [
	            [0,0,0,0,1,1,0],
	            [0,0,1,1,0,0,0],
	            [0,1,1,0,0,0,0],
	            [1,1,0,0,0,0,0],
	            [1,1,0,1,1,1,0],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,1,1,1,0]
	        ],//6
	        [
	            [1,1,1,1,1,1,1],
	            [1,1,0,0,0,1,1],
	            [0,0,0,0,1,1,0],
	            [0,0,0,0,1,1,0],
	            [0,0,0,1,1,0,0],
	            [0,0,0,1,1,0,0],
	            [0,0,1,1,0,0,0],
	            [0,0,1,1,0,0,0],
	            [0,0,1,1,0,0,0],
	            [0,0,1,1,0,0,0]
	        ],//7
	        [
	            [0,1,1,1,1,1,0],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,1,1,1,0],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,1,1,1,0]
	        ],//8
	        [
	            [0,1,1,1,1,1,0],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [1,1,0,0,0,1,1],
	            [0,1,1,1,0,1,1],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,0,1,1],
	            [0,0,0,0,1,1,0],
	            [0,0,0,1,1,0,0],
	            [0,1,1,0,0,0,0]
	        ],//9
	        [
	            [0,0,0,0],
	            [0,0,0,0],
	            [0,1,1,0],
	            [0,1,1,0],
	            [0,0,0,0],
	            [0,0,0,0],
	            [0,1,1,0],
	            [0,1,1,0],
	            [0,0,0,0],
	            [0,0,0,0]
	        ]//:
	    ];
		
	var WINDOW_WIDTH = 1024;
	var WINDOW_HEIGHT = 768;
	var RADIUS = 8;
	var MARGIN_TOP = 60;
	var MARGIN_LEFT = 30;

	var endTime = new Date();
	endTime.setTime(endTime.getTime()+1000*3600*10);
	var curShowTimeSeconds = 0

	var balls = [];
	const colors = ["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"]

	window.onload = function(){
		WINDOW_WIDTH = document.documentElement.clientWidth;
		WINDOW_HEIGHT = document.documentElement.clientHeight;
		
		MARGIN_LEFT = Math.round(WINDOW_WIDTH/10);
		MARGIN_TOP = Math.round(WINDOW_HEIGHT/5);
		RADIUS = Math.round(WINDOW_WIDTH*4/5/108)-1;
		
	    var canvas = document.getElementById('canvas');
	    var context = canvas.getContext("2d");

	    canvas.width = WINDOW_WIDTH;
	    canvas.height = WINDOW_HEIGHT;

	    curShowTimeSeconds = getCurrentShowTimeSeconds()
	    setInterval(
	        function(){
	            render( context );
	            update();
	        }
	        ,
	        20
	    );
	}

	function getCurrentShowTimeSeconds() {
	    var curTime = new Date();
	    /* var ret = endTime.getTime() - curTime.getTime();
	    ret = Math.round( ret/1000 ); */
		
	    var ret = curTime.getHours()*3600+curTime.getMinutes()*60+curTime.getSeconds();
	    
	    return ret >= 0 ? ret : 0;
	}

	function update(){

	    var nextShowTimeSeconds = getCurrentShowTimeSeconds();

	    var nextHours = parseInt( nextShowTimeSeconds / 3600);
	    var nextMinutes = parseInt( (nextShowTimeSeconds - nextHours * 3600)/60 )
	    var nextSeconds = nextShowTimeSeconds % 60

	    var curHours = parseInt( curShowTimeSeconds / 3600);
	    var curMinutes = parseInt( (curShowTimeSeconds - curHours * 3600)/60 )
	    var curSeconds = curShowTimeSeconds % 60

	    if( nextSeconds != curSeconds ){
	        if( parseInt(curHours/10) != parseInt(nextHours/10) ){
	            addBalls( MARGIN_LEFT + 0 , MARGIN_TOP , parseInt(curHours/10) );
	        }
	        if( parseInt(curHours%10) != parseInt(nextHours%10) ){
	            addBalls( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(curHours/10) );
	        }

	        if( parseInt(curMinutes/10) != parseInt(nextMinutes/10) ){
	            addBalls( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(curMinutes/10) );
	        }
	        if( parseInt(curMinutes%10) != parseInt(nextMinutes%10) ){
	            addBalls( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(curMinutes%10) );
	        }

	        if( parseInt(curSeconds/10) != parseInt(nextSeconds/10) ){
	            addBalls( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(curSeconds/10) );
	        }
	        if( parseInt(curSeconds%10) != parseInt(nextSeconds%10) ){
	            addBalls( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(nextSeconds%10) );
	        }

	        curShowTimeSeconds = nextShowTimeSeconds;
	    }

	    updateBalls();
	}

	function updateBalls(){

	    for( var i = 0 ; i < balls.length ; i ++ ){

	        balls[i].x += balls[i].vx;
	        balls[i].y += balls[i].vy;
	        balls[i].vy += balls[i].g;

	        if( balls[i].y >= WINDOW_HEIGHT-RADIUS ){
	            balls[i].y = WINDOW_HEIGHT-RADIUS;
	            balls[i].vy = - balls[i].vy*0.6;
	        }
	    }
	    
	    //删除已出屏幕的小球
	    var cnt = 0
	    for( var i = 0 ; i < balls.length ; i ++ )
	        if( balls[i].x + RADIUS > 0 && balls[i].x -RADIUS < WINDOW_WIDTH )
	            balls[cnt++] = balls[i]

	    while( balls.length > Math.min(300,cnt) ){//Math.min(300,cnt)最多300个小球
	        balls.pop();
	    }
	}

	function addBalls( x , y , num ){

	    for( var i = 0  ; i < digit[num].length ; i ++ )
	        for( var j = 0  ; j < digit[num][i].length ; j ++ )
	            if( digit[num][i][j] == 1 ){
	                var aBall = {
	                    x:x+j*2*(RADIUS+1)+(RADIUS+1),
	                    y:y+i*2*(RADIUS+1)+(RADIUS+1),
	                    g:1.5+Math.random(),
	                    vx:Math.pow( -1 , Math.ceil( Math.random()*1000 ) ) * 4,//随机产生1或-1
	                    vy:-5,
	                    color: colors[ Math.floor( Math.random()*colors.length ) ]
	                }

	                balls.push( aBall )
	            }
	}

	function render( cxt ){

	    cxt.clearRect(0,0,WINDOW_WIDTH, WINDOW_HEIGHT);

	    var hours = parseInt( curShowTimeSeconds / 3600);
	    var minutes = parseInt( (curShowTimeSeconds - hours * 3600)/60 )
	    var seconds = curShowTimeSeconds % 60

	    renderDigit( MARGIN_LEFT , MARGIN_TOP , parseInt(hours/10) , cxt )
	    renderDigit( MARGIN_LEFT + 15*(RADIUS+1) , MARGIN_TOP , parseInt(hours%10) , cxt )
	    renderDigit( MARGIN_LEFT + 30*(RADIUS + 1) , MARGIN_TOP , 10 , cxt )
	    renderDigit( MARGIN_LEFT + 39*(RADIUS+1) , MARGIN_TOP , parseInt(minutes/10) , cxt);
	    renderDigit( MARGIN_LEFT + 54*(RADIUS+1) , MARGIN_TOP , parseInt(minutes%10) , cxt);
	    renderDigit( MARGIN_LEFT + 69*(RADIUS+1) , MARGIN_TOP , 10 , cxt);
	    renderDigit( MARGIN_LEFT + 78*(RADIUS+1) , MARGIN_TOP , parseInt(seconds/10) , cxt);
	    renderDigit( MARGIN_LEFT + 93*(RADIUS+1) , MARGIN_TOP , parseInt(seconds%10) , cxt);

	    for( var i = 0 ; i < balls.length ; i ++ ){
	        cxt.fillStyle=balls[i].color;

	        cxt.beginPath();
	        cxt.arc( balls[i].x , balls[i].y , RADIUS , 0 , 2*Math.PI , true );
	        cxt.closePath();

	        cxt.fill();
	    }
	}

	function renderDigit( x , y , num , cxt ){

	    cxt.fillStyle = "rgb(0,102,153)";

	    for( var i = 0 ; i < digit[num].length ; i ++ )
	        for(var j = 0 ; j < digit[num][i].length ; j ++ )
	            if( digit[num][i][j] == 1 ){
	                cxt.beginPath();
	                cxt.arc( x+j*2*(RADIUS+1)+(RADIUS+1) , y+i*2*(RADIUS+1)+(RADIUS+1) , RADIUS , 0 , 2*Math.PI )
	                cxt.closePath()

	                cxt.fill()
	            }
	}








	</script>
</body>
</html>